How to ignore a filed of Entity with Room

user_7098269 0
Viewed 3793

I have a data class that I created an Entity from that for my database.

this is my data class:

@Entity
@Parcelize
data class Tapligh(

    @PrimaryKey(autoGenerate = true)
    var id: Long,

    @SerializedName("title") var title: String?,
    @SerializedName("type") var type: Int?,
    @SerializedName("os") var os: Int?,
    @SerializedName("logo") var logo: String?,
    @SerializedName("template") var template: String?,
    @SerializedName("action") var action: String?,
    @SerializedName("date") var date: String?,
    @Embedded
    @SerializedName("videos") var videos: Videos?,

) : Parcelable {

    fun getTaplighType(): Int {

        return when (this.type) {

            0 -> TaplighType.IMAGE.type
            1 -> TaplighType.VIDEO.type
            else -> TaplighType.NATIVE.type
        }
    }
}

@Parcelize
data class Videos(

    @SerializedName("land") var land: String?,
    @SerializedName("port") var port: String?
) : Parcelable

Now by adding below field into my Tapligh data class, I will get an error: 

 @Ignore
 @SerializedName("images") var images: List<String>?

I am getting this error:

error: Entities and Pojos must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).
public final class Tapligh implements android.os.Parcelable {
             ^
data-class android-room kotlin android
3 Answers

@Ignore in Kotlin classes requires default parameter value and @JvmOverloads annotation:

data class Tapligh  @JvmOverloads constructor(
    ...

    @Ignore
    @SerializedName("images") var images: List<String>? = null
)
user_93161680

Sometimes new field create an error when class implements Parcelable, so try to remove Parcelable and body of class, put Parcelable and implement members again or just implement Serializable interface instead of Parcelable.

user_90805270

The provided Taplight has errors:

@PrimaryKey(autoGenerate = true) var id: Long,
@SerializedName("title") var title: String?,
@SerializedName("type") var type: Int?,
@SerializedName("os") var os: Int?,
@SerializedName("logo") var logo: String?,
@SerializedName("template") var template: String?,
@SerializedName("action") var action: String?,
@SerializedName("date") var date: String?,
@Embedded
@SerializedName("videos") var videos: Videos?) {

constructor() : this(0,null,null,null,null,null,null,null,null)

videos seems like the last argument and the constructor was badly called. I don't know if that was a copy-paste or formatting error, but hope it could help.

user_6032700
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